A novel control method for dual mode time-sharing grid-connected inverter

Author

Wu, Weimin ; Geng, Houlai ; Geng, Pan ; Ye, Yinzhong ; Chen, Min

Author_Institution

Dept. of Electr. Eng., Shanghai Maritime Univ., Shanghai, China

fYear

2010

fDate

12-16 Sept. 2010

Firstpage

53

Lastpage

57

Abstract

A dual mode time-sharing inverter has higher efficiency than other type grid-connected inverter due to only one power stage of it working in high frequency state at any time. In this paper, small signal modeling of this inverter is carried out, which reveals that the control-to-grid current transfer function of this inverter has a right half plane zero at low frequency during the “Boost” operating stage which results in the difficulty in controlling the system. An indirect current control method based on instantaneous power balance is proposed. The right-half plane zero can be eliminated and a satisfactory compensator with enough phase margin and amplitude margin can be obtained with this new control strategy. And it is evaluated through simulation and experimental results of a 1kW prototype.

Keywords

compensation; electric current control; invertors; power grids; power system interconnection; transfer functions; amplitude margin; compensation; dual mode time-sharing inverter; grid-connected inverter; indirect current control method; phase margin; transfer function; Bridge circuits; Choppers; Equations; Inverters; Mathematical model; Switches; Transfer functions; Small-signal-model; Time-sharing operation; dual mode control; full-bridge inverter; grid-connected; instantaneous power balance;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2010 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

978-1-4244-5286-6

Electronic_ISBN

978-1-4244-5287-3

Type

conf

DOI

10.1109/ECCE.2010.5618077

Filename

5618077